Amazon.com: Blue Topaz Ring. 1-48 of over 4,000 results for "blue topaz ring" Results. Price and other details may vary based on product size and color. Ross-Simons. 1.80 Carat Sky Blue Topaz, 2.40 ct. t.w. Sapphire and .80 ct. t.w. London Blue Topaz Ring in 18kt Gold Over Sterling. 16. $8900. FREE delivery Tomorrow, Nov 8. Silpada.